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McCarthy, Catherine P.
Catherine P. McCarthy
P: +1.202.828.5839
F: +1.800.404.3970

Sandra Liboro


Catherine McCarthy has represented clients on energy regulation and policy matters for over two decades. She has experience with obtaining Federal Energy Regulatory Commission (FERC) and state authorizations for major projects and transactions; FERC compliance and enforcement matters; FERC transmission and centralized markets issues; and rate, tariff and refund matters. She also represents energy clients before the Department of Energy, the Federal Communications Commission and the Nuclear Regulatory Commission. Cathy joined the firm from Dewey & LeBoeuf where she was a partner and co-head of its 25 lawyer Energy Regulatory group.

Cathy has been recognized as one America's Leading Lawyers for Energy Law by Chambers USA (2010-2016) and Chambers Global (2014-2017); selected as one of The American Lawyer's "45 Under 45" (2011); and included in The Legal 500 United States, Energy: Regulatory (2011-2013, 2016).

Representative Matters

Represented an international energy company with U.S. regulatory approvals for its combination with another energy player, creating the world's largest independent power producer

Represented a company with respect to its $450 million acquisition of a waste-to-energy business

Represented an energy company in its (now-terminated) $9.1 billion acquisition of another key energy player

Represented an energy company in a $300 million acquisition

Represented an energy company in its $7.4 billion sale to a consortium of infrastructure funds

Represented an energy company in a $8.1 billion merger

Represented an energy company in a $9.4 billion acquisition

Publications and Speeches

"FERC Reconsiders Horizontal Market Power in Transactions," Law360, September 2016.

Panelist, "Energy & Utilities Sector" Financier Worldwide, December 2015.

Co-author, "Energy Infrastructure Development Faces Impediments," Natural Gas Electricity, April 2015.

Panelist, "Impacts of New FERC ROE Calculation Formulae on Transmission Owners and Projects," Infocast’s 18th Annual Transmission Summit, March 2015.

Lecturer, "FERC Compliance" and "FERC Investigation Process," Portland, OR, October 2014.

Lecturer, "Regulatory Approvals in Transactions," Washington, DC, August 2014.

Lecturer, "FERC Compliance," Houston, TX, May 2014.

Lecturer, "Utility M&A: Mid-Year Update," SNL Energy Webinar, September 2013.

"Rolling Off Long-Term Power Sales Agreements?  Plan Ahead to Avoid Regulatory Speed Bumps," 21stAnnual North American Waste-to-Energy Conference, April, 2013.

"Takeaways from FERC’s Recent Due Diligence Order," Law360, February 2013.

"Energy & Utilities Sector Roundtable," Financier Worldwide, December 2012.

Lecturer, "Uncharted Territory: Lessons Learned and Next Steps in Light of Recent FERC Enforcement Orders," Houston, TX, December 2012.

"New FERC Guidance Signals More Developer Hurdles," Law360, November 2012.

"FERC Order 1000 gives transmission planning an update," Windpower Engineering & Development, April 2012.

Lecturer, "Transmission Incentives and Order 1000," Yale Alumni in Energy Annual Conference, New Haven, CT, March 2012.

Lecturer, "Due Diligence Workshop - SNL EXNET Power & Utilities M&A Symposium," New York, NY , January 2012.

Lecturer, "FERC Order 1000: Road Map and Speed Bumps," SNL Energy Webinar, January 2012.

"Discussing FERC and EPA Interplay," Law360, November 2011.

"A New Era of Natural Gas in North America," Law360, November 2011.

"Fueling Fresh Analysis of Horizontal Market Power," Law 360, March 2011.

Moderator, "Infrastructure of the Future," Amelia Island, FL, October 2010.

"FERC and DOJ/FTC Market Power Issues In Energy M&A," Washington, D.C., June 2010.

"Sharyland - An REIT Pioneer," Law360, May 2010.

"The Facilitation of Nonincumbent Transmission Projects," Law360, May 2010.

"IP Concerns and Smart Grid Development," Law360, September 2009.

"FCC Approvals for Utility Transactions Can Become Unexpected Pitfall," Natural Gas & Electricity Journal, June 2006.

"FERC Strongly Enforcing Compliance Regulations about Interlocking Directorates," Natural Gas & Electricity Journal, May 2006.


J.D., Georgetown University Law Center, 1993
B.A., Yale University, 1989

Bar Admissions

District of Columbia
New York


Chambers & Partners, Chambers Global, Energy: Electricity (Regulatory & Litigation), 2014-2017
Chambers & Partners, Chambers USA, Energy: Electricity (Regulatory & Litigation), 2010-2016
Legalease, The Legal 500 United States, Energy: Regulatory, 2012-2013, 2016; Energy: Transaction and Regulatory, 2011
Euromoney Institutional Investor plc, Expert Guides, Energy & Natural Resources, 2012-2016; Banking & Finance Transactional (Project Finance), 2012; Project Finance, 2011
Euromoney Institutional Investor plc, Expert Guides, Women in Business Law, Energy & Natural Resources, 2012-2016; Project Finance, 2013 
Thomson Reuters, Washington, D.C. Super Lawyers, 2013, 2015-2016
The American Lawyer, "45 Under 45," January 2011
Administrative Editor, Georgetown Immigration Law Journal
Adjunct professor, The Catholic University of America, Columbus School of Law (1996-1998)
Vice Chair of Electricity Committee, Public Utilities, Communications, and Transportation Law Section, American Bar Association